1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289ae83facce2b0b8d4713fa3d0e0d9a97a8eac7fa979570dd852fef0a63e1dd. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d819023-272e-4a84-aa33-eb702802be6f.json and https://artists.proofprofile.net/proofs/artist/0d819023-272e-4a84-aa33-eb702802be6f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0d73416234bdc45309486d284df7deb2acb6820512590ede1d984be4029211. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5W2300445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0f83f45739ad6443a7018746121ce9075c60d32cc51c2238593d51312e4319. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5W2300448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18889151499fc83294c9a1dc0469b308f0fe30c881b2888d259766937f534945. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5W2300449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0d73416234bdc45309486d284df7deb2acb6820512590ede1d984be4029211. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5W2300445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90c99d18e874ebcae77a61d38dbbf5cf0bccea95ce564ac3802a16d8c4ddc2d. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5W2300447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582e09782da0b69b7de39074524f845369dd1abc207736743bbcfc14bb32c04e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5W2300446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d82b75f3470bfd71a4f4a15b743e1e0eeb53c84a2e742c4556f1117ff2c7fb. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3e70aac0bd12cba22228ccf16d24ee7e611554e9cd489923751b3e26a37b85. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3bc771d3b561536b2674a0725ff03573d3aa60f607ced72e2abe6003c5b04d. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f81a048bd78c6bfecefaa89315f1e29859e1e42401e6e0879f5256f1f0613c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c93e9f566f8c7d5c21233261822de32ca27e701191e7a7b13432b92ef514303. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016ca0370b5b99d7d61e0d5a8c2311bdc08d5f2dfbb15306698414e86dd2a015. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2720c15e416bab7a8980bc1d77dba2ae7122c5b3c2a47ffd5ec3a61e5276bbe0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21bf55c81581bda9a83a2baca2d39d2f269f67817eedca5a55f9ed3341f8c84. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17d3f9911dbb96db3840141bbaa3270d350dce5400f977f5030bfc689ff2864. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACX1761626.